async function getHTML(endpoint, options = {}) {
  let query = {};
  if (options._query !== undefined) {
    query = options._query;
    delete options._query;
  }

  const params = new URLSearchParams(query);
  const res = await fetch(`${endpoint}?${params}`, options);

  return { body: await res.text(), status: res.status };
}

const validateBase64Img = dataURL => new Promise(resolve => {
  const img = new Image();
  img.onload = () => {
    resolve(img.width === 88 && img.height === 31);
  };
  img.src = dataURL;
});

export const b = {
  init: 'badgeEditorInit',
}

const badgeEditorEndpoint = '/hyperapi/badges/editor/'
const MAX_BADGES = 10;
let badgesCount = 0;
let customImageDatas = {};

export async function badgeEditorInit(_, __, el) {
  const res = await getHTML(badgeEditorEndpoint);
  if (res.status != 200) {
    return;
  }
  el.innerHTML = res.body;
  badgesCount = el.querySelectorAll('.sortable-item').length;
  b.trigger('badgeEditorAssignImgId');
  b.trigger('setBadgeCount');
}

export function badgeEditorAssignImgId(_, __, el) {
  if (el.dataset.imgId) return;

  const id = b.uuid();
  const filePicker = el.querySelector('input[type=file]');
  const img = el.querySelector('img.badge-button');
  console.log(img);
  el.dataset.imgId = id;
  filePicker.dataset.imgId = id;
  img.dataset.imgId = id;
}

export function badgeEditorSetPreview(ev, sender, el) {
  if (!sender.parentNode.contains(el)) return;

  const selectedItem = sender.selectedOptions[0];
  if (selectedItem.value !== 'custom') {
    el.src = selectedItem.dataset.filePath;
  } else if (customImageDatas[el.dataset.imgId]) {
    el.src = customImageDatas[el.dataset.imgId];
  } else {
    el.removeAttribute('src');
  }
}

export function badgeEditorSetPreviewCustom(payload, _, el) {
  if (!payload.badge.contains(el)) return;
  if (!customImageDatas[el.dataset.imgId]) {
    el.removeAttribute('src');
  } else {
    el.src = customImageDatas[el.dataset.imgId];
  }
}

export function badgeEditorToggleFilePicker(ev, sender, el) {
  if (!sender.parentNode.parentNode.contains(el)) return;

  const selectedItem = sender.selectedOptions[0];
  const picker = el.querySelector('input[type=file]');
  if (selectedItem.value !== 'custom') {
    el.classList.add('hidden');
    picker.required = false;
    picker.setCustomValidity('');
  } else {
    el.classList.remove('hidden');
    picker.required = true;
    picker.setCustomValidity(picker.dataset.validity || '');
  }
}

export function badgeEditorAddBadge(ev, sender, el) {
  // TODO: page templates do not get updated on mutation
  const badge = document.getElementById('badge-template').innerText;
  el.innerHTML += badge;
  b.trigger('badgeEditorAssignImgId');
  badgesCount++;
  b.trigger('setBadgeCount');
}

export function badgeEditorDelete(ev, sender, el) {
  if (!el.contains(sender)) return;
  el.remove();
  badgesCount--;
  b.trigger('setBadgeCount');
}

export function badgeEditorShowFilePicker(ev, sender, el) {
  if (sender.nextElementSibling !== el) return;
  el.showPicker();
}

export async function badgeEditorFileSelected(ev, sender, el) {
  const file = sender.files[0];
  const badge = sender.parentNode.parentNode;

  if (
    !['image/png', 'image/jpeg', 'image/jpg', 'image/webp'].includes(file.type)
  ) {
    sender.dataset.validity = 'The badge file must be an image.';
    sender.setCustomValidity(sender.dataset.validity);
    sender.reportValidity();
    customImageDatas[sender.dataset.imgId] = null;
    b.send({ badge: badge }, 'badgeEditorSetPreviewCustom');
    return;
  }
  if (file.size >= 1000 * 500) {
    sender.dataset.validity = 'The badge image must be smaller than 500KB.';
    sender.setCustomValidity(sender.dataset.validity);
    sender.reportValidity();
    customImageDatas[sender.dataset.imgId] = null;
    b.send({ badge: badge }, 'badgeEditorSetPreviewCustom');
    return;
  }

  const reader = new FileReader();
  reader.onload = async e => {
    const dimsValid = await validateBase64Img(e.target.result);
    if (!dimsValid) {
      sender.setCustomValidity('The badge image must be exactly 88x31 pixels.');
      sender.reportValidity();
      customImageDatas[sender.dataset.imgId] = null;
      b.send({ badge: badge }, 'badgeEditorSetPreviewCustom');
      return;
    }
    customImageDatas[sender.dataset.imgId] = e.target.result;

    sender.dataset.validity = '';
    sender.setCustomValidity('');
    b.send({ badge: badge }, 'badgeEditorSetPreviewCustom');
  }

  reader.readAsDataURL(file);
}

export function setBadgeCount(_, __, el) {
  if (el instanceof HTMLButtonElement) {
    el.disabled = badgesCount === MAX_BADGES;
  } else {
    el.innerText = `${badgesCount}/${MAX_BADGES}`;
  }
}